Enter a soldier's customization menu, go to the character info menu, and enter one of the following names to unlock the corresponding character. Note: This only works in the single player campaign and disables trophies from being earned and removes all your previous soldiers' attributes.

Hero

Name

Beaglerush (Grenadier)

Beaglerush (nickname)

Peter Van Hoorn (Assault Build Ranger Colonel)

Peter Van Hoorn

Sid Meier (Psi Operative Magnus)

Sid Meier

Easy "Brutal Collection" trophy

Use Skulljack on the four different ADVENT soldier types listed below to get the "Brutal Collection" trophy. The hacking outcome does not matter.

Officer (the red unit). This is story related.

Stun Lancer (unit with the sword)

Shieldbearer (unit with white armor)

Trooper

Easy "Heavy Metal" trophy

Research the EXO and War Suits from the Proving Grounds to be able to research Experimental Heavy Weapons and Experimental Powered weapons, respectively. Do this enough times to obtain one of each type of the following weapons:

Heavy Weapons (requires EXO Suit)

Flamethrower

Rocket Launcher (unlocked EXO Suit is researched)

Shredder Gun

Powered Weapons (requires EXO or WAR Suit)

Blaster Launcher

Hellfire Projector

Plasma Blaster

Shredstorm Cannon

After obtaining the required weapons, equip your soldiers with W.A.R armor. Give each of them a different heavy or powered weapon. Start a mission with Advent soldier enemies. Get into position, then save the game. Kill an Advent soldier with one of the weapons, reload the saved game, then kill the same enemy with another type of weapon. Repeat this process until all the weapons were used to kill an enemy to get the "Heavy Metal" trophy.

Easy "Heroes Of The Resistance" trophy

To do this without losing your entire squad, focus on killing enemies as quickly as possible instead of rescuing the civilians one-by-one. Also, try drawing the enemies attention to have them attack you instead of the civilians.

Easy "Now Am I Become Death" trophy

Use the "Faceoff" Sharpshooter ability to fire at every visible target in range using the pistol. If there are at least three wounded or weak enemies in range, use that ability.

This can also be done with the Ranger's "Reaper" ability. Kill an enemy with the sword to get another action so you can kill another enemy. Repeat the process in a chain.

Trophies

Successfully complete one of the following tasks to get a trophy:

Commander (Platinum): Unlocked all other XCOM 2 trophies.

Immortal Commander (Gold): Overthrow the aliens on Legend difficulty.

Valhalla (Gold): Beat the game on Commander+ difficulty in Ironman mode.

Beginner's Luck (Silver): Beat a mission in June or later using only Rookies.

Brutal Collection (Silver): Skulljack each different type of ADVENT soldier (does not have to be in same game).

Defender of Humanity (Silver): Overthrow the aliens on Commander difficulty.

Exquisite Timing (Silver): Beat the game on Commander+ difficulty by July 1st.

Global Resistance (Silver): Get all of the continent bonuses available in a single campaign.

Heavy Metal (Silver): Kill an enemy with every heavy weapon in the game (doesn't have to be in the same game).

Overpowered (Silver): Beat a mission on Commander+ with a squad of soldiers only of the same class (but not Rookie).

The Few and the Proud (Silver): Beat the game on Commander+ difficulty without buying a Squad Size upgrade.

The Untouchables (Silver): Beat the game on Commander+ without losing a soldier.

Who Needs Tygan? (Silver): Beat the final mission using only conventional gear.

A Better Human Being (Bronze): Recover the Forge Item.

A Dark Doorway (Bronze): Recover the Psi Gate.

A Final Stand (Bronze): Create the Commander's Avatar.

A God Falls (Bronze): Kill an Avatar.

A Grim Key (Bronze): Recover a Codex Brain.

A Horrible Truth (Bronze): Recover the Blacksite Data.

A Line Crossed (Bronze): Complete the Avatar Autopsy.

Breathing Room (Bronze): Kill a Viper who is strangling a squadmate.

Bring It Down (Bronze): Sabotage an alien facility.

Car Explosion (Bronze): Cause an enemy to die in a car explosion.

Codebreaker (Bronze): Build the Shadow Chamber.

Come Back To Me (Bronze): Kill a Sectoid who is currently mind controlling a squadmate.